/* ═══════════════════════════════════════════════════════════════════════════
   BCAI Agent — Dark AI-native theme
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
    --bg-base:        #0d0f14;
    --bg-surface:     #161920;
    --bg-elevated:    #1e2129;
    --bg-hover:       #252833;
    --border:         #2a2d36;
    --border-subtle:  #1f2230;

    --accent:         #6c8ef5;
    --accent-hover:   #8aaaf8;
    --accent-glow:    rgba(108, 142, 245, 0.15);
    --accent-glow-sm: rgba(108, 142, 245, 0.08);

    --text-primary:   #e8eaf0;
    --text-secondary: #b0b4c8;
    --text-muted:     #7a7f9a;
    --text-accent:    #6c8ef5;

    --success:        #4caf82;
    --success-bg:     rgba(76, 175, 130, 0.12);
    --warning:        #e8a84c;
    --warning-bg:     rgba(232, 168, 76, 0.12);
    --danger:         #e85c5c;
    --danger-bg:      rgba(232, 92, 92, 0.12);

    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  14px;
    --radius-xl:  20px;

    --sidebar-width: 240px;
    --header-height: 52px;
    --input-height:  72px;

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;

    --transition: 150ms ease;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
    height: 100%;
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
textarea, input { font: inherit; color: inherit; background: none; border: none; outline: none; resize: none; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); }

/* ── Landing page ──────────────────────────────────────────────────────────── */
body.landing {
    display: flex;
    align-items: center;
    justify-content: center;
}

.landing-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 48px;
    max-width: 420px;
    text-align: center;
}

.landing-card .logo {
    font-size: 22px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 20px;
    letter-spacing: -0.3px;
}

.landing-card p { color: var(--text-secondary); margin-bottom: 12px; }
.landing-card .muted { color: var(--text-muted); font-size: 13px; }
.dev-note { color: var(--warning) !important; font-size: 12px !important; }

/* ── App shell ─────────────────────────────────────────────────────────────── */
#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ── Header ────────────────────────────────────────────────────────────────── */
#app-header {
    height: var(--header-height);
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    flex-shrink: 0;
    z-index: 10;
}

.header-logo {
    font-size: 15px;
    font-weight: 600;
    color: var(--accent);
    letter-spacing: -0.2px;
}

.header-usage {
    font-size: 13px;
    color: var(--text-muted);
    padding: 5px 12px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: 20px;
}

.header-usage strong {
    color: var(--text-primary);
    font-weight: 500;
}

/* ── Body layout ───────────────────────────────────────────────────────────── */
#app-body {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* ── Sidebar ───────────────────────────────────────────────────────────────── */
#sidebar {
    width: var(--sidebar-width);
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
}

.btn-new {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 16px 12px 8px;
    padding: 9px 14px;
    background: var(--accent-glow-sm);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.btn-new:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent-hover);
}

.btn-new span {
    font-size: 18px;
    line-height: 1;
    color: var(--accent);
}

#conv-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px 16px;
}

#conv-list::-webkit-scrollbar { width: 4px; }
#conv-list::-webkit-scrollbar-track { background: transparent; }
#conv-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

.conv-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-item:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
}

.conv-item.active {
    background: var(--accent-glow);
    color: var(--text-primary);
}

.conv-item::before {
    content: '◦';
    color: var(--text-muted);
    flex-shrink: 0;
    font-size: 10px;
}

.conv-item.active::before {
    content: '▸';
    color: var(--accent);
}

/* ── Chat area ─────────────────────────────────────────────────────────────── */
#chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--bg-base);
}

#messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

#messages::-webkit-scrollbar { width: 4px; }
#messages::-webkit-scrollbar-track { background: transparent; }
#messages::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── Empty state ───────────────────────────────────────────────────────────── */
.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 40px;
    text-align: center;
    color: var(--text-muted);
}

.empty-state .empty-icon {
    font-size: 36px;
    opacity: 0.4;
    margin-bottom: 8px;
}

.empty-state h3 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 13px;
    max-width: 360px;
    line-height: 1.7;
}

.example-prompts {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 8px;
    width: 100%;
    max-width: 400px;
}

.example-prompt {
    padding: 8px 14px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    text-align: left;
    transition: background var(--transition), border-color var(--transition);
}

.example-prompt:hover {
    background: var(--bg-elevated);
    border-color: var(--accent);
    color: var(--text-primary);
}

/* ── Message bubbles ───────────────────────────────────────────────────────── */
.message {
    display: flex;
    flex-direction: column;
    max-width: 720px;
}

.message.user { align-self: flex-end; align-items: flex-end; }
.message.agent { align-self: flex-start; align-items: flex-start; }

.bubble-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 5px;
    padding: 0 4px;
}

.message.agent .bubble-label { color: var(--accent); }

.bubble {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    line-height: 1.65;
    font-size: 14px;
}

.message.user .bubble {
    background: var(--accent-glow);
    border: 1px solid rgba(108, 142, 245, 0.3);
    color: var(--text-primary);
    border-bottom-right-radius: var(--radius-sm);
}

.message.agent .bubble {
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    color: var(--text-primary);
    border-bottom-left-radius: var(--radius-sm);
    width: 100%;
}

/* ── Typing indicator ──────────────────────────────────────────────────────── */
.message.typing .bubble {
    padding: 16px 22px;
}

.typing-dots {
    display: flex;
    align-items: center;
    gap: 5px;
}

.typing-dots span {
    width: 7px;
    height: 7px;
    background: var(--accent);
    border-radius: 50%;
    animation: dot-bounce 1.2s infinite ease-in-out;
    opacity: 0.5;
}

.typing-dots span:nth-child(2) { animation-delay: 0.2s; }
.typing-dots span:nth-child(3) { animation-delay: 0.4s; }

@keyframes dot-bounce {
    0%, 80%, 100% { transform: translateY(0); opacity: 0.4; }
    40%            { transform: translateY(-6px); opacity: 1; }
}

/* ── Preview card ──────────────────────────────────────────────────────────── */
.preview-card {
    margin-top: 12px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 14px;
    cursor: pointer;
    user-select: none;
    transition: background var(--transition);
}

.preview-header:hover { background: var(--bg-hover); }

.preview-count {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 500;
}

.preview-count .count-badge {
    background: var(--accent-glow);
    border: 1px solid rgba(108, 142, 245, 0.3);
    color: var(--accent);
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
}

.preview-toggle {
    color: var(--text-muted);
    font-size: 12px;
    transition: transform var(--transition);
}

.preview-card.expanded .preview-toggle { transform: rotate(180deg); }

.preview-body {
    display: none;
    border-top: 1px solid var(--border-subtle);
}

.preview-card.expanded .preview-body { display: block; }

.preview-items {
    padding: 0;
    margin: 0;
    list-style: none;
}

.preview-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    border-bottom: 1px solid var(--border-subtle);
    font-size: 13px;
    color: var(--text-secondary);
    gap: 12px;
}

.preview-item:last-child { border-bottom: none; }

.preview-item .item-name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    flex: 1;
}

.preview-item .item-sku {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-muted);
    flex-shrink: 0;
}

.preview-item .item-price {
    font-weight: 500;
    color: var(--text-primary);
    flex-shrink: 0;
    font-variant-numeric: tabular-nums;
}

.preview-more {
    padding: 8px 14px;
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
    border-top: 1px solid var(--border-subtle);
}

.schedule-note {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: var(--warning-bg);
    border-top: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--warning);
}

.no-schedule-note {
    padding: 8px 14px;
    background: var(--warning-bg);
    border-top: 1px solid var(--border-subtle);
    font-size: 12px;
    color: var(--warning);
}

/* ── Action buttons ────────────────────────────────────────────────────────── */
.bubble-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 12px;
    gap: 8px;
}

.bubble-cost {
    font-size: 12px;
    color: var(--text-muted);
    flex: 1;
}

.bubble-cost .cost-amount {
    color: var(--text-secondary);
    font-weight: 500;
}

.action-buttons { display: flex; gap: 8px; }

.btn {
    padding: 7px 16px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 500;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-commit {
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
}

.btn-commit:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-cancel {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-cancel:hover {
    background: var(--bg-hover);
    color: var(--text-secondary);
    border-color: var(--text-muted);
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Completed state badge */
.status-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 500;
}

.status-badge.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid rgba(76, 175, 130, 0.3);
}

.status-badge.error {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(232, 92, 92, 0.3);
}

/* ── Result card ───────────────────────────────────────────────────────────── */
.result-card {
    margin-top: 10px;
    padding: 10px 14px;
    background: var(--success-bg);
    border: 1px solid rgba(76, 175, 130, 0.25);
    border-radius: var(--radius-md);
    font-size: 13px;
    color: var(--success);
    display: flex;
    align-items: center;
    gap: 8px;
}

.result-card.error {
    background: var(--danger-bg);
    border-color: rgba(232, 92, 92, 0.25);
    color: var(--danger);
}

/* ── Input bar ─────────────────────────────────────────────────────────────── */
#input-bar {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 12px 16px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}

#prompt-input {
    flex: 1;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    max-height: 160px;
    transition: border-color var(--transition), box-shadow var(--transition);
}

#prompt-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow-sm);
}

#prompt-input::placeholder { color: var(--text-muted); }

#btn-send {
    width: 40px;
    height: 40px;
    background: var(--accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition), transform var(--transition);
    color: #fff;
}

#btn-send:hover { background: var(--accent-hover); transform: scale(1.05); }
#btn-send:active { transform: scale(0.95); }
#btn-send:disabled { background: var(--bg-hover); color: var(--text-muted); cursor: not-allowed; transform: none; }

#btn-send svg { width: 16px; height: 16px; }

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Toasts ────────────────────────────────────────────────────────────────── */
#toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 9999;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 18px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0,0,0,0.4);
    font-size: 13px;
    color: var(--text-primary);
    min-width: 280px;
    max-width: 400px;
    pointer-events: all;
    animation: toast-in 0.2s ease;
    cursor: pointer;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error   { border-left: 3px solid var(--danger);  }
.toast.info    { border-left: 3px solid var(--accent);  }

.toast-icon { font-size: 16px; flex-shrink: 0; }
.toast.success .toast-icon { color: var(--success); }
.toast.error   .toast-icon { color: var(--danger);  }
.toast.info    .toast-icon { color: var(--accent);  }

.toast.fade-out { animation: toast-out 0.2s ease forwards; }

@keyframes toast-in {
    from { opacity: 0; transform: translateY(12px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0)    scale(1); }
}

@keyframes toast-out {
    from { opacity: 1; transform: translateY(0); }
    to   { opacity: 0; transform: translateY(8px); }
}

/* ── Scrollbar (global) ────────────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }